rails/rails — pull request #18100 by chancancode (2014-12-19 21:50:43+00:00)
Title: Allow static asset serving from env variable (enhanced!)

![ENHANCE](http://img.pandawhale.com/post-25572-spy-kids-enhance-gif-imgur-zVDI.gif)

Improved upon #17347 to address some comments, added deprecation for the old name, etc